I was impressed with how solidly this was built. Fit and finish were very good and the jaws move smoothly.This unit is a bit big and heavy for my small benchtop mill but fit OK with a little work. The bottom keys fit quite precisely in the vise base. I had to take off material to fit the slots in the mill table. The mounting bolts needed the same treatment and then worked fine. Note that these mods are because of the small mill - not any issues with the vise itself.